# A178119 (b-file synthesized from sequence entry) 0 1 1 2 2 5 3 16 4 64 5 308 6 1727 7 11008 8 78244 9 611060 10 5184338 11 47366320 12 462782080 13 4807659368 14 52853722811 15 612426360832 16 7453621425532 17 94997205901940 18 1264555335831662 19 17540102647480336 20 252979919852470672